A column packed with 5-cm polypropylene saddles (a = 55 m 2 /m 3 ) is being

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A column packed with 5-cm polypropylene saddles (a = 55 m2/m3) is being designed for the removal of chlorine from a gas stream (G = 100 mol/s · m2, 2.36% Cl2) by countercurrent contact with an NaOH solution (L = 250 mol/s · m2, 10% NaOH, CB = 2736 mol/m3) at about 40-45°C and 1 atm. How high should the tower be for 99% removal of chlorine? Double the calculated height to take care of deviations from plug flow.

Data

The reaction Cl2 + 2NaOH → product is very very fast and irreversible. For these very high flow rates (close to the limits allowed) an extrapolation of the correlations in Perry 6th ed., section 14, giveska = 133 mol/hr.m.atm ka = 45 hr-1 HA 125 x 106 atm. m/mol = = 1.5 x 10- m/s

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